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78 KZ650B stock carbs with kerker and pods
- jzanutto
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07 Apr 2009 17:27 #279264
by jzanutto
1978 KZ650B 2004 BMW R1150RT
78 KZ650B stock carbs with kerker and pods was created by jzanutto
now that I have your attention, my setup is a 78 650B with stock carbs, non-accelerator pump model. The bike has a Kerker and pods. A 110 main really isnt that big for this setup is it?? I dont think so...
I only have about 30 miles on the bike since owning it and rebuilding it, and at high rpm it starts to break up. I thought it was over-jetted and too rich but was surprised to see a 110 main. So now I'm thinking that my advancer isnt working correctly. Anyone else think the same or am I missing something else??
I only have about 30 miles on the bike since owning it and rebuilding it, and at high rpm it starts to break up. I thought it was over-jetted and too rich but was surprised to see a 110 main. So now I'm thinking that my advancer isnt working correctly. Anyone else think the same or am I missing something else??
1978 KZ650B 2004 BMW R1150RT
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- anarki650
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07 Apr 2009 19:04 #279300
by anarki650
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
Replied by anarki650 on topic 78 KZ650B stock carbs with kerker and pods
Your main is probably too small with that set up. On my 77 kz650 with stock carbs, Emgo pods, MAC 4-1 (w/ baffle) I was running 17.5 pilot jets, needle on the 4th clip, and 115 mains. Minus the baffle I had to jump up to 117.5 mains.
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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07 Apr 2009 19:38 #279329
by jzanutto
1978 KZ650B 2004 BMW R1150RT
Replied by jzanutto on topic 78 KZ650B stock carbs with kerker and pods
just rechecked the advancer. It works like new.
Lean shouldnt break up and act like a rev limiter, I've always seen lean as a sag in power
the plugs are a little too dark to be lean.
Lean shouldnt break up and act like a rev limiter, I've always seen lean as a sag in power
the plugs are a little too dark to be lean.
1978 KZ650B 2004 BMW R1150RT
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07 Apr 2009 20:12 #279338
by flht1997
Matt Milwaukee, WI
75' KZ400, (5) 78' KZ400, 76' KZ 750, 78' KZ650
78'CB750F, 78' CB550K
89' BMW R100RT
05' H-D Electra Glide
06' KLR650
Do it right or don't bother doing it at all.
Replied by flht1997 on topic 78 KZ650B stock carbs with kerker and pods
my all stock 78' 650 is 15 on the pilot and 102 on the mains. it will pull cleanly to redline, the 110 seem like they may be a tad fat. you are certain the ignition is up to snuff? mine use to break up pretty bad above 6k or so, but i change the points out for kawasaki electronic and all is well now. the only thing i plan for the carbs is 17.5 pilots just to try and improve the tip-in a bit.
Matt Milwaukee, WI
75' KZ400, (5) 78' KZ400, 76' KZ 750, 78' KZ650
78'CB750F, 78' CB550K
89' BMW R100RT
05' H-D Electra Glide
06' KLR650
Do it right or don't bother doing it at all.
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07 Apr 2009 20:12 #279339
by anarki650
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
Replied by anarki650 on topic 78 KZ650B stock carbs with kerker and pods
Did you read the plugs just off a wide open throttle plug chop or after mixed riding? If mixed riding you won't get an accurate plug read because you could be a little rich in the mid circuit which can mask the lean read on the main jet. I went rounds with that until I did a plug chop for every circuit to make sure they were all dialed in. My mid range was rich, most of my riding occurred on the needle circuit, so the few times I cracked WOT the plugs never got a pure reading of the main jet circuit...
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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07 Apr 2009 20:59 #279345
by jzanutto
1978 KZ650B 2004 BMW R1150RT
Replied by jzanutto on topic 78 KZ650B stock carbs with kerker and pods
yeah I will check. I also have an off-idle stumble in the low circuit. I brake into a corner, roll back on the throttle and get a little cutout but then it comes right back on. the pilots are 15
1978 KZ650B 2004 BMW R1150RT
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08 Apr 2009 18:17 #279658
by jzanutto
1978 KZ650B 2004 BMW R1150RT
Replied by jzanutto on topic 78 KZ650B stock carbs with kerker and pods
oh man its getting sweet now. I opened my low end airscrews and leaned out the low. the off-idle stumble is gone, and the upper cutout is getting a lot better. I'm going to go maybe another 1/4 turn lean on the low circuit airscrews.
So here's another related question. I use my choke as an indicator of mixture at various throttle settings. I set my throttle at the setting I want, then let the bike stabilize at the speed then start to open the choke.
If it stumbles worse, then its still too rich- if it smoothes out then its lean and asking for fuel. So I did a high speed run, just into the stumble zone and opened the choke. It stumbled worse, so I figure its still a bit rich up top.
Tell me whether I'm on track with this thinking....
So here's another related question. I use my choke as an indicator of mixture at various throttle settings. I set my throttle at the setting I want, then let the bike stabilize at the speed then start to open the choke.
If it stumbles worse, then its still too rich- if it smoothes out then its lean and asking for fuel. So I did a high speed run, just into the stumble zone and opened the choke. It stumbled worse, so I figure its still a bit rich up top.
Tell me whether I'm on track with this thinking....
1978 KZ650B 2004 BMW R1150RT
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